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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5678a9f081069d89a7268e57343de9c6310385ca2290b8c430097e2ef7ec4d' 
  AND token = 'AkxAuxnMwAnvip+/JOnyd2bPOmp5k0LvOXuIDgkoQZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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