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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd778dab3c920ead33504864160aa7b3ca2b64812446d18b60a36ee38f28983d9' 
  AND token = 'E3Wl+Kj71Ssk2o0GaQgPgaOrdDdUcUBjqE+i+61UPGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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