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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50483187d44a8c54f05d7eb956b89bb31ea90425be5e2367b6ebaadd6047eaf' 
  AND token = 'NBTOggtWgRzj30a9fDL0P/igs7By1voFRMP9kHGSjqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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