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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b54a4b3be97e2272461c71d70ceca3603de6373713e208c4eb6f57ac495ea654' 
  AND token = 'Ks2rY46aCy323yPmKtD9SpCMawI2kOw7Od2jA8Vf+n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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