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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21cb300b62b9c90fa7f1ebfdd4054813feb37920fedf20c5e1641001285f6cdc' 
  AND token = 'Tz3eJG9AX8g7J7ILZFMbsurZW8fAESUZwjB/l+es/CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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