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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aba94978b5d0069e89158fbe2a5f4def78955805f1ef66b239e2d951889f969' 
  AND token = '5oYeWK/2dBO7jLJBtXHhRsMGS6SVr2clFsKQV45Qtn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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