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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb93358807adbc65f86ae96c970ade2a793e8ee945ba7782114f962df044ee63' 
  AND token = 'Ahjp/KBfwdrPSBC6/g7h7Sj/AF5AEf1AjFPHlCA8DT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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