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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b264e22ab4d57b28881554cbf1a0f28fc655f9d7eee7b3e77aa934dd262c02' 
  AND token = 'hgZEUGrqmtLrI2Tn3Zhe8cBePCOmAcR/kQ/6a6/q1LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}