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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a85a089a9916de77898e3e4df948d69cc61ff828eb4f500a05a0d4b473b48a' 
  AND token = '6WI395YOUWVbhfQTHzgkZo7bVfMp4Vz0hn57NA6R3EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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