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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd69a0803ae7a56986ee53482b5dad4e408674e676ded0bab39b8c7d3a6c0a1' 
  AND token = 'gxUK2o6/PiN/4G49aG3MJwsEMPI1uO5wip0ZNHkaDPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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