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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b46770fc16e0398ed6d86a13a2aff71a17b197aa2db4b836a79b6acbbec4841' 
  AND token = 'XWYI7+io4YJ7TJ5JNve0s1TZKoL9/DIcLSKu5l9MYGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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