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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8611b2c4b60230372db0cc196b3a376a21a99805d8a1d5ea9d43ba1e738217' 
  AND token = 'k/Q+uvsBZS7flEf6I5L0Tx76T+a9lOQ7FPkTMSNtZk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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