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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b2cedc3a0d817aa19ff8951b052aafb28a2e5e6c349668c8644387a1c1912a' 
  AND token = 'efQ968NQuwZU+pnj5732j14JCVvzjJfID8g940KyPzU=' 
  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"
    }
  }
}