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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd49604e3ddca109e7a6e58a43936e743e26b7ce15f6351bbb2a75f3d04e8357a' 
  AND token = 'vaAze105Q0k/hslYEVEUkf1tp9G8LOzeDFe+9BRK8HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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