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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683a6b0e839ccd66c93ab961c35df2848ce21eea5a485a7fc58e1e216d64aded' 
  AND token = 'K2055WmkMHKbAqyIH2QePfLvUQ6+bx4qH98HY3hQe9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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