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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde72f0ecf965f0a52b4cba8e0e5acc4a8cbf4994e7a8a6d05527d1638b83dcd' 
  AND token = 'B1tNvSMnoripyaFpjfnAk9RmjVaY9yWNRcxQIEum3H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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