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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53435264d0c749855f36b2cd8d90e1d9df44a6834919e8fad66704db8a8a70e4' 
  AND token = 'X7SXfB1369i1Yd4SBkgfG3GxzBqa7oqx2W9Md9tUe2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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