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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570a1af3a07b02b1ae6ed221560ce3660952eb13c8cbd82b96e5cac11d48059c' 
  AND token = 'eQ/4ywOkDjr9/PgWuuuGyYSEfhyt3sS3AWdtvyTGYsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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