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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b01c19ee5019792a9e791b5f01e19f9e6c2cb7d4e520eadd129006491ecd8f' 
  AND token = '+WldP3j1KB5eSvBObLurZDz8fOE54ZeDPrUzVhpJLNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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