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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed696d72d9c7538171a3946eb69d9931ae3d39082e91dbfc64b8a93ead1439b' 
  AND token = 'xGOt4HxfcYlTL/kX4ccmwZdrx74nH39nVUy/WEb77AA=' 
  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"
    }
  }
}