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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1ce962b306215b94adfb025ad333aac556be40356f13bd2436b64f9e08ad77' 
  AND token = 'R4oVOALCJ2lkljpuRZVc/243NV935221Z7gGo+PQe2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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