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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079104c33154e64e21b242b8c9093988077398d9558ce5d5019ad8dd80275273' 
  AND token = 'We947TvBgNP3an1E+e9Dq3afJttuhlMCNlyqdCuZdCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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