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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0989405d90534917b4116f6974ff3d197abf01b5a655e7aa530e7b1e1641a42' 
  AND token = '5vLUDyecjzrlMXsIWtv7El1fyZiIO5mZWVwAQuFhFd0=' 
  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"
    }
  }
}