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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6416c0777e85d1a70cdd90b29010577d9695c60a11f86228558774a21acd9cbe' 
  AND token = 'nxtAJn8FZoAny3ZTI3Fvu36eeP7rj2ob3XdRe0F+tNQ=' 
  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"
    }
  }
}