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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6f34c4284fdbed8f2644a528c07090a02546868f37d7857e106915c43a910f' 
  AND token = 'Xsc04u8o2mnBTY/heJYyM3b1fqU3ZM5wx8esghQ1AUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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