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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9077ff271affeebd47d71839ab86570398ba60c341cb078694a15da3a03f50ad' 
  AND token = 'tQCfZCVR0qzXTanZ1ALIjKpGER508m0GqB1J/vq7IIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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