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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de0f93956027b560bd6b8e0598772f5cb49e34c85d45a86d903109fed30692d' 
  AND token = 'F7iMGC2C6bgVIo4GlO3NfMFVrMsHH/W9SophKGoClH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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