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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9358a5524002a801524f260bc8d4de62177716729a565c7743586a0062dd95a2' 
  AND token = 'gr9nH2AWRjGbGl7UOiwxaQFQ+uFOC8Ls/n6jbrG3iT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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