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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef80ad5673d85f01cf31f8bdcf4a6dbfa8b3a7ea1fc8de113fbd23ca1f78936a' 
  AND token = 'TbSX6rC7jpZKbc8M89iKAQI3U4h2WuP2Vu+S5rfUizM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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