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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e3fd88ec391bd701d1339ed206afaa48b55e459da6d37056c4292eb1d38d89' 
  AND token = 'O/UP7TM/kk9xiI1zzRwaHQxamohKd0aXynGBYnLjlWU=' 
  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"
    }
  }
}