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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2560cde568f5084f0da981cde24f09e041c1eebe303a5a5990e7915946f407f2' 
  AND token = '01nHal7hz/crK3RebXs8mVSq3hFlys94UGFpg52qMG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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