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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc88b58c682fc7202565569414cd8e61b14438c8b096810cd552c56cf9630fa1' 
  AND token = 'Lrdklycm0+X8t3yQ4D7Ap7lOy7Vr+Inh1AjKjB4Iuws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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