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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433cfee8a8e0fe9edf8b4c516f149bb788c99d418ea86ae7d6c83cdffbc5de0a' 
  AND token = 'uSgO1Qq7zn/j/v8KHBD5FiYwgo7We57/U56A+QRtc5w=' 
  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"
    }
  }
}