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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424b1b048f0d9ea5fbb7c188929691346f54968e9f73a8c112d6dcf9a6f648c0' 
  AND token = 'gnGhihY0kRhf843rsAAor1yrjXFxOPFX4ZCfXUs3Oxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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