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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb84de826288807a89d7d81226f96b56b807d2470ebbbbe8f3bf7d9876fecd9f' 
  AND token = 'k6bZ90yD6vZwA2XYE241m0amAwIL68BLzgTEwVyKAug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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