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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5648f005cd76c439b72b3b35c921d0a0c304f84005b4bf13d1de40df27fbf592' 
  AND token = 'Hno+2cOcKxB4o9AcqhCl81bFnDQh0XnAuKrLBPWHKfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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