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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc04f851db077ebf9503f9a61e3720e9257308b398863661100e0993589239a8' 
  AND token = 'NS6wMEDrHSRv5EYoqjvSp2fTbH16fKbVjBh8ZxIJ2ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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