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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4347dfd6fed33ecf6df9bc07ba2dbc1f4cfdc9000184f5f75f9e19bd547ede3e' 
  AND token = 'hktSHf4d78nLqmeU/vnkSRkpJteZPSm4y71+iZMlIoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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