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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca88396286bb0046171f4b4a2eccfbdc6793b489f85ce6b5d1e8d9a4517fd8b' 
  AND token = 'kIegCBIDj2Cnq+dHvo22CDH+8dd+VGb/sjEEOFQ8/GQ=' 
  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"
    }
  }
}