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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3807f52201900b723051ac024304889c7b6761fe510d10d2d4e77b4224c83f' 
  AND token = '9ncsImxl8tqHfxLKsq7DEqg50of2bJ3md0MVQPRFMD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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