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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c98919ba455e27ee98b11e8c9032a27f7066d351f501e5ae1e40d1ba205799' 
  AND token = 'EjSAQaGT0Jjur+U6GCb4LzIrnkJA3fMeeZjB4K5NFYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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